Survey of Midlife in Japan (MIDJA 2), May-October 2012 (ICPSR 36427)
Version Date: Feb 19, 2018 View help for published
Principal Investigator(s): View help for Principal Investigator(s)
Carol D. Ryff, University of Wisconsin-Madison; Shinobu Kitayama, University of Michigan; Mayumi Karasawa, Tokyo Christian Woman's University; Hazel Markus, Stanford University; Norito Kawakami, University of Tokyo; Christopher Coe, University of Wisconsin-Madison
Version V3 (see more versions)
Summary View help for Summary
In 2008, with funding from the National Institute on Aging (NIA), baseline survey data for the Survey of Midlife in Japan (MIDJA), April-September 2008 were collected from a probability sample of Japanese adults (N=1,027) aged 30 to 79 from the Tokyo metropolitan area (ICPSR 30822). In 2009-2010 biomarker data was obtained from a subset of these cases (ICPSR 34969).
The survey and biomarker measures obtained parallel those in a national longitudinal sample of Americans known as Midlife in the United States or MIDUS (ICPSR 2760: MIDUS 1 and ICPSR 4652: MIDUS 2). The central objective was to compare the Japanese sample (MIDJA) with the United States sample (MIDUS) to test hypotheses about the role of psychosocial factors in the health (broadly defined) of mid- and later-life adults in Japan and the United States.
In 2012, with additional support from NIA, a longitudinal follow-up of the MIDJA sample was completed. The data collection for this second wave (N=657) largely repeated the baseline assessments. The goal of the follow-up wave was to conduct comparisons of longitudinal data available from the Japanese sample (MIDJA) and the United States sample (MIDUS) to test the hypothesis about the role of psychosocial factors in predicting health changes (including biomarkers) in both cultural contexts. Cultural influences on age differences in health and well-being were also of interest.
Demographic and background information included gender, age, education, marital status, household composition, and income.
Funding View help for Funding
Subject Terms View help for Subject Terms
Geographic Coverage View help for Geographic Coverage
Smallest Geographic Unit View help for Smallest Geographic Unit
Distributor(s) View help for Distributor(s)
Time Period(s) View help for Time Period(s)
Date of Collection View help for Date of Collection
Data Collection Notes View help for Data Collection Notes
The data in this collection can be linked to MIDJA and MIDUS data sets using the variable MIDJA_IDS. The documents "Guide to Merging the MIDJA and MIDUS Survey Data Files" and "MIDJA 1 to MIDJA 2 and MIDUS Roadmap" should be consulted when merging the data files.
Additional information about the Survey of Midlife in Japan can be found at the MIDUS Web site.
The title of this study was changed from Survey of Midlife Development in Japan (MIDJA 2), May-October 2012, to Survey of Midlife in Japan (MIDJA 2), May-October 2012, on May 9, 2017.
Study Purpose View help for Study Purpose
The overarching goal of the MIDJA (Midlife in Japan) study was to conduct a multidisciplinary study of health and well-being in a sample of middle- and older-aged Japanese adults. A first primary aim was to collect survey data on a probability sample of adults from the city of Tokyo, Japan. A second aim was to recruit a subsample of respondents from the above survey to participate in a related biomarker study (to be released for public use at a later date).
Study Design View help for Study Design
The initial, baseline, data collection occurred in two phases. The first phase, survey data collection was conducted by Central Research Services (CRS), a survey research firm based in Tokyo. Following the convention of social surveys in Japan, the "deliver-and-pick-up" method was used for data collection Participants in the second phase, a subset of those completing the survey, completed biomarker and other assessments in a local clinic as well as at home (saliva samples, questionnaire).
The overarching goal of the Midlife Health in Japan (MIDJA) study was to conduct a multidisciplinary study of health and well-being in a sample of middle- and older-aged Japanese adults. The design and scientific content of the study were comparable to an ongoing longitudinal study in the U.S., known as MIDUS (Midlife in the U.S.). Parallels between the two provide unique opportunities to investigate how cultural differences in self and relational factors predict life course variations in well-being and health.
Funding for a longitudinal follow-up was obtained in February 2012. This second wave of data collection also occurred in two phases. The first phase, survey data collection, was conducted by Shin Joho Center, a survey research firm based in Tokyo. Consistent with the baseline data collection the "deliver-and-pick-up" convention was once again followed. Participants in the second phase, biomarker assessments, once again completed biomarker assessments in a local clinic as well as at home.
Sample View help for Sample
All respondents who completed the baseline MIDJA Survey were eligible to participate in this longitudinal follow-up.
Time Method View help for Time Method
Universe View help for Universe
Noninstitutionalized, Japanese-speaking adults, who completed the MIDJA baseline survey (ICPSR 30822) in April 2008-September 2008.
Unit(s) of Observation View help for Unit(s) of Observation
Method of Data Collection View help for Method of Data Collection
Mode of Data Collection View help for Mode of Data Collection
Description of Variables View help for Description of Variables
This collection includes information about the following types of variables: health, cigarettes, alcohol, emotion or feelings, work, finances, personal beliefs, social network, neighborhood, life overall, friends, marriage or close relationship, children, family, religion and spirituality, parents' health, and scale variables.
Response Rates View help for Response Rates
The response rate for the longitudinal follow-up is 73.7 percent. Reasons for nonresponse included: moved, address unknown, absent during time of survey, illness/injury, hospitalized, deceased. Detailed information regarding the response rates for various aspects of the MIDJA data collection is located in the "MIDJA Study Summary."
Presence of Common Scales View help for Presence of Common Scales
Please refer to the "Documentation of Scales and Constructed Variables in MIDJA 2" for complete information regarding the scales for the MIDJA data collection.
Original Release Date View help for Original Release Date
Version History View help for Version History
2018-02-19 This collection is being updated, per request from the PI, to reflect a title change; the corresponding downloadable files are only being updated to reflect the title change, where applicable.2018-02-15 The citation of this study may have changed due to the new version control system that has been implemented. The previous citation was:
- Ryff, Carol D., Shinobu Kitayama, Mayumi Karasawa, Hazel Markus, Norito Kawakami, and Christopher Coe. Survey of Midlife in Japan (MIDJA 2), May-October 2012. ICPSR36427-v3. Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributor], 2018-02-19. http://doi.org/10.3886/ICPSR36427.v3
2016-05-17 The ICPSR Sequential Record Identifier has been removed from the downloadable data.
2016-05-13 ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major statistical software formats as well as standard codebooks to accompany the data. In addition to these procedures, ICPSR performed the following processing steps for this data collection:
- Created online analysis version with question text.
- Checked for undocumented or out-of-range codes.
The public-use data files in this collection are available for access by the general public. Access does not require affiliation with an ICPSR member institution.